For model years 2009-2012 GL-1800, if you wish to use the XM satellite radio feature of your audio system, in conjunction with PART NO. 40-9437 or 40-9436 digital music changer, use this adapter harness/switch kit

This harness kit will allow you to switch back and forth between XM satellite radio and the J&M digital music player/changers, without the two audio sources mixing together at the same time